According to embodiments of the present document, a prediction procedure may be performed for image/video coding, and the prediction procedure may include symmetric motion vector differences (SMVDs) and merge mode motion vector differences (MMVDs) according to an inter prediction. The inter prediction may be performed on the basis of reference pictures of a current picture, and types (e.g., a long term reference picture, a short term reference picture, etc.) of the reference pictures may be considered for the inter prediction. Therefore, performance and coding efficiency in the prediction procedure can be improved.
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2. The method of claim 1, wherein an MVD is derived based on the information on the MVD, and the motion vector for the current block is derived based on a sum of the MVD and the MVP.
This invention relates to video encoding and decoding, specifically improving motion vector prediction to enhance compression efficiency. The problem addressed is the need for more accurate motion vector prediction to reduce bitrate while maintaining video quality. The invention describes a method for deriving a motion vector difference (MVD) and a final motion vector for a current block in a video frame. The MVD is calculated based on stored information about the MVD itself, rather than relying solely on traditional prediction methods. The final motion vector for the current block is then derived by summing the MVD with a motion vector predictor (MVP). The MVP is typically obtained from neighboring blocks or other reference sources. By refining the MVD calculation, the method improves prediction accuracy, reducing the residual motion information that must be encoded, which leads to better compression efficiency. The invention applies to both encoding and decoding processes, ensuring compatibility across video compression standards. The technique is particularly useful in advanced video codecs where precise motion estimation is critical for high-quality video at lower bitrates.
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December 14, 2021
December 6, 2022
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